Recorders quickly become hoarse in cool rooms and during the cold season. This is due to the condensation of moisture from breathing in the cold recorder head. The droplets make the instrument sound "hoarse". This can be easily and elegantly remedied with a heatable recorder bag. Why a heatable recorder bag makes sense. Small heating surfaces are sewn into the top of the bag, which are powered by a small battery (accessory). Three different temperature levels can be selected using a switch. None of the levels will harm your recorder. We have tested this extensively. We have selected a suitable rechargeable battery (also known as a "power bank") for you. You can find it in our accessories in the "heatable packaging" section. We certainly don't need to mention that you also protect your instruments from cracks. Heatable bags are the best place to transport your instruments and warm them up before playing.